Clarify test server error code #3212
Merged
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Motivation
The NIOHTTP1TestServer had a weird codepath where we could hit errors configuring the channel pipeline, but we weren't sure why. I've investigated, and this happens because a Channel that had been accepted earlier was closed while we were waiting to start handling it. This is totally benign: the code works just fine in that situation.
To be clear, though, let's document the behaviour and add a test.
Modifications
Result
More confidence.